The distillation behaviors of some fission product fluorides in LiCl–KCl system were investigated. For rare earth element, the corresponding decontamination factors (DFs) of Ce in 5 wt% CeF 3 –LiCl–KCl salts were over 100 at 1040 K and 13 Pa. For SrF 2, the very poor DFs was deduced for the presence of more volatile SrClF, while Zr 4+ was observed to complex easily with F − and Cl − , which affected its evaporation rate and the separation efficiency. F ion concentration in condensate salt was 1–2 level higher than the metal ion due to the stronger covalent band.

中文翻译：

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LiCl-KCl熔盐中氟化物的蒸馏行为

研究了一些裂变产物氟化物在 LiCl-KCl 体系中的蒸馏行为。对于稀土元素，在 5 wt% CeF 3 –LiCl–KCl 盐中，Ce 的相应去污因子 (DFs) 在 1040 K 和 13 Pa 下超过 100。对于 SrF 2，推导出非常差的去污因子，因为存在更多挥发性的 SrClF，而观察到 Zr 4+ 容易与 F - 和 Cl - 络合，这影响了其蒸发速率和分离效率。由于共价带更强，因此凝聚盐中的 F 离子浓度比金属离子高 1-2 个水平。